Explanation:
Oracle Net Configuration Assistant is provided primarily to configure basic network components during installation, including: listener names and protocol addresses, naming methods the client will use to resolve connect identifiers to connect descriptors, net service names in a tnsnames.ora file, directory server usage. When you use the Oracle Net Configuration Assistant to specify the naming method sqlnet.ora file is updated. Incorrect Answer:
1: It does not modify init.ora initialization file.
3: Even Oracle Net Configuration Assistant is provided to configure listener names and protocol addresses, but listener.ora file will not be affected if you use the Oracle Net Configuration Assistant to specify the naming method.]
4: Tnsnames.ora file will be modified if you use the Oracle Net Configuration Assistant to specify the net service names.
Reference:
OCP Oracle 9i Database: Fundamentals II Exam Guide, Rama Velpuri, p. 89-92
Chapter 4: Basic Oracle Net Services Client-Side Configuration

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